Eighteen species of brachyuran crabs blonging to eleven genera and four families have been documented from the intertidal belt of Prentice Island in Sundarbans, India. Mean population density, biomass and species composition differs among different zones of the intertidal belt. Substrate characteristics, the presence and absence of mangrove vegetation, the salinity, the degree of tidal innundation and exposure are presumed to be the important factors determining the zonation of the species studied.